Sewing machine



Jan. 2, 1923. l,440,556

J. scHRElBER.

SEWING MACHINE. FILED MAY 21. 1921. 17 SHEETS-SHEET 1 llllllllnmm......l

17 sHEETs-sHEET 2 J SCHRE BER. SEWING MAcHlNz-z Fl LED MAY 21 1921 Jan. 2, 1923.

Mil

Jan. 2,1923. 1,440,556

JT' SCHRE BER. SEWING MACHINE:

F1 LED MAY 2l l92 A 17 SHEETS-SHEET 6 Jan, 2, i923. I 1,440,555

J. SCHREIBER.

SEWING MACHINE, FILED MAY '21, 1921 17 SHEETS-SHEET 7 Jan. 2, 1923. 1,440,556

l J. SCHREIBER.

SEWING MACHINE. F|| ED MAY 21, 1921. 17 SHEETS-SHEET 8 l Jan. 2, 1923. l 1,440,556

J, SCHREIBER. SEWING MAcHINE. FILED MAY 21, |921. 17 SHEETS-sneer l0 511%refer',

17 SHEETS-SHEET I3 Jan. 2, i923.

J. SCHREIBER. SEWING MACHINE F||.ED MAY 2l. i921.

Jan. 2, 1923.

J. SCHREIBER SEWING MACHINE 17 SHEETS-SHEET I4 FMD MAY 21 19'21 Jan. 29 1923,

. J. SCHREIBER.

SEwlNG MACHINE. F1 LED MAY 2l 1921 17 SHEETS-SHEET l5 f5 .wwf w Ww .mw Mlm r Il..

Jan. 2, 1923. 1,440,556

SCHREIBER. SEWING MAcHmE ,Fl :JED MAY 2l i921 I7 SHEETS-sneer I6 Jan. 2,` 1923.

FILED MAY 2l, 192l Patented Jari.. `2, 1923.

JOHN serien-IEEE, or s'r. LOUIS, MISSOURI.

appiicat'ion aidnay 21, i921.

T0 all States State o citizenof the United city of St. Louis and SEWING MACHINE.

Lv/wm it may concern: vBe it known that 1, JOHN SGHREIBER,

a residing at the f Missouri, have invented a new and useful Sewing Machine, of which the following is a specification.

This invention relatesl to improvementsin sewing machines and consists in the novel Aconstruction hereinafter dis closed.

An object of thevinvention is to provide a sewing machine equipped with ynovel, stitchforming mechanism principally lfor lsewing leather parts of shoes and the like, in which the stitches are `formed through a puncture in the yla to be united,.a lsecond loop inserted through the side of matesaid first-named lloop on `ria-l opposite from its'point from a loopv passed yers ,of material of entry, and a lock-thread inserted in the second loop, the whole stitchlbeing 'drawn within the material so as to protect it from wear.

Another object of the invention is to provide a machine of the equipped with stitching mechanism to form a stitchof the character mentioned, andw'ith improved means for the stitching' mechanism.

feeding class described o' the thread to Another object ofthe invention is to provide a machine ofthe class described for forming afstitch of the character mentioned equipped with novel means the worlr so as to produce rapidly,

Another object of the vide in a machine of the cla .proved means forming mechanism.

for advancing` Another object ofthe invention is provide in a machine of the class described an improved form of mechanism for controlling and operating the stitch-formingv mechanism, theworlr feed and thread-feeding mechanism so that the mechanisms of the 'machine willv'be accurately and properly synchronized in operation. Many additional improve vantages will be apparent from'the .follow-` d structural ading detailed description of the invention,

taken in connection withthe accompanying drawings 'in which- Y Fig. 1 is a front elevation of the machine.

Fig. 2 is a rightside elevation of the machine, relative'to the oper front of the machine.

Fig. 3 is a top plan view ator facing the of the machine.

eIicient-ly and` an even row of stitching.

invention is to pross rdescribed im for regulating the stitch- Seral No. 471,314.

the front head mechanism removed.

Fig. V7 isa rightside elevation relative to the operator, partially in section, showing Vthe cam housing and apart of the front head and'partV of thread feeding mechanism in vertical section.

Fig. 8 is a horizontal section taken on an rintermediate line through the front head and cam housing of the machine.

Fig. 9 is an enlarged front elevation of the machine with the thread-feeding attachment removed. i

Fig. 10 is a cross section through the front head taken substantially on a line such as 10-10 of Fig. 4.

Fig. 11 is a cross section through the fronty head of the machine taken on a line such as 11-11 of Fig.f4r.

Fig. 12 is a diagram of the front cam which is a part lof the operating mechanism. Fig. 13 is a diagram ofthe intermediate cam. i

Fig. 14 is a diagram of the rear cam. Fig. 15 is a cross section through the front part of the cam Yhousing showing detailsof the driving mechanism for the thread-feeding attachment.

Figs. 16, 17 and 18 are views of the stitchforming mechanism in its-several operative positions, the consecutive cycles of operations being illustrated in the consecutive views.y l

Fig. 19 is a sectional view through the material joined by the stitch, illustrating the stitch as formed by the machine. Fig. 20 is a plan view of the attached.

Fig. 21 is a front elevation of the same mechanism, with'the front cover plate removed.

Fig. 22is a transverse horizontal section taken on a line such as 29d- 22 `of Fig. 21.

:23 is a sectional view of the clutch device between the cam shaft and the drivy 100k-arena i feeding mechanism, with the tront cam plate ving Fig.

. ig. 24 is a topuplan view of the lockpulley, taken on the line 23423 of thread feeding device. l Fig. 25 is a front elevation of ythe 'saine element. Fig. 26 is a section on the line 264426 of Fig. 27 is an enlarged fragmentary plan Viewy of a portion of the lockthread feeding device; A z 1 Fig. 28 is a plan view oithe `lock-thi),ead .feeding mechanism with the top cover plate therefor removed. j.' Fig. 29 isa rrear. ,eleyati'on of 'the lockkthread feeding mechanism-- Fig-30 isa right side elevation of the locktliread feedingmechanisin.-

Fig.y 31 is a `vertical section throughtlie same mechanism. Y .1.

The frame ofthe machine consists of a beso l having @hollow pedestal. or oolu'ma, .supporting a com. housing; 3,V -iihiohgs ,proerably formed separate -from `,thepedestal 4or 'column and attached thereto by bolts 4,. yThe vfront head frani e 5 i s attached to the front .ond of .tho` oomlhouoos 13, the loolithfoad feeding device frame 6 i being ca rri e d at the r lower front end ofthe front head. Aframe. .30%` rllhe stitching mechanism requiresthree separate strands of thread and forthepur- Y, nos@ yoffido HQifyiles the -flifforent 4Stlolools the one will befdesignated thread OIT, iipper loop, the other thread for lower-,loop,' andthe third ythread forlocl;l thread, said strands r'booe' nm'elooroolrospeotroly 7 Sand 9l vThe thread 7 is 'taken from aispool 1Q that is carriool .by .a bracket ll :bolted to they right Side ci thepedestal oiycolunin 2. Rising from y lio ,the bracket 1.1- isgan .arrn; 12having anA eye formed therein near its extremity through whichthe-thread'passes i From the, armI 12, v the thread 7 [passes k through a thread lockingand tensioning device. This `device includes a stern 13 (Fig. 7) mounted in a boss 14 formedon the top i of the front head frame, `the vlower end of A. said stein extending through and below the top wall of the front head yirame. The uply per end of the stem 13 .pi'oje cts through ,the

top wall cfa cap 15 that is attached tothe face ofthe boss 14 by screws 16. The stem 1 3 has an annular flange-17. An expansion spring 18 encirclesthe stemy 13l above, they 55. lange 17 and `is,"iiesteol between the flange and the top wall of thecap 15, the tendency of the spring being to depress the'stem `13.

Y (Fig.

The thread 7 vvis passed through a theoppo'site Vside'being provided merely for slot in the right 'side of the cap, is looped around-the stem 13 between vthe-liange17 vand the kwasher 19' and is passed'out-of the i l slotin the same side ofthe cap, the sloton convenience in threading the thread through the device. The locking and tensioningy det.vice Ifunctions to'nrelease the thread, maintaining 'suiiicient pressure thereon to prevent over-running of the thread yand toV preserve lthe necessary. tensionthereon when the.v

thread-is carried forward to `iori'n the loop, as y.hereafiter described.,v j Afterfthe loopv yhas beenv 'formed andnfhenthejstitchv` is being folded intothe material, the thread-is locked "8o against forwardfmovementpermitting thek istitching Vmechaiii'sin 5toy drfawfthe :thread u tight'into theVVV material. This operation of the vlocking and tensioning 4device i'sfacconiplished by .means of. a'camibarf22 ',(Fig. 7) "85 'that'is' slidably mounted ina channelforin'ed within the` upper wall `ofth'ejcamhousing by langes23, dependingffrom thet'opw'alloil Said `housing .(rigs.' 'rami- Thisl @am rear end of the cam housing fand' carriesV "a `.roller24mountedfon a ,p'in`1'2 (,Figsgand extending th'oughl'the Icani barf, ir`roin the topothe bottom'thereojthe roller beingi mountedv onjthe lower extension' of lsaid: pinv 95 of which will be more fully described hereinafter.

The forward end of the'eambar 22has an inclined cam slot26 (Fig. that extends obliquely upwardlyfrom tliejend of the cam '105 bar andrupon which the `lower eiidof,v the stem 13 rests, the end ofthe stembein-glattened to enter-the slot and prevent thel stem`` from-turning.

The siem is is 'pmiden with "a maaiaifiio releasing device in the iorin `ot a camlever 27 having a cam face 28 operating on the topwall of kthe cap 15'7 the said lever being `pivoted to the end of the stem by a `screw 29; When thelever is in, a vertical 115 position, as illustrated particularly in Fig.

7 of the drawings, the 1stein 13 israised sov i Vthat the stein 13 vis held against downward 'movement by the spring 18. yInjthis posh.A tion the ,washerI .19 'is yielding-ly'"supported 120.f yby the spring 2 0 so` thaty 'the pressure between the under faceoftheange 17 andv thef upper face ofthe washer 1`9Qis a yield-v ing pressure, permittingjthe thread to be. drawn vforward with oiily"`sutlicient tension l A to p reventitfrom over-running.

Th'isvposil f` tion ofthe' device'y is vthe released@po'sition7 and is konly assumed when itisdes'ired te reduce the `tension Vand restraintl on 'the thread 7 asl *wheny the thread is being 130 fdrawn forward by hand for threading `the stitching mechanism. y

When the lever'27 isdepressed the stem 13 is free to move in its mounting and when it is in its lowest position the washer 19 'rests on the upper wall of they boss 14.

In this position the vspring 18 has suilicieiit tension to hold the faces of `the flange 17 and the washer 19in close adjustment so l0 tween thewaslier 19 and the flange 17 to permit the thread 7 to be drawn forwardly .xby the stitching mechanism, and yet there is sullicient tension toiretard the over-running of the thread and to hold it taut betweeny the tensioning` device and the needle.

From the tensioning device the vthread 7 is passed under a guide roller supported on an ear 31 the front head housing.

formed on the upper tace ot .en arm 32 extends outwardly and across the roller groove to prevent the thread from slipping, out of 'the groove in the roller. From the roller 30 thethread passes over asecond roller 33 supported at the extremity of a rocker arm 34 thatconstitutes a means for pulling the stitch into the material after the stitch has been formed, an-dl also serves to hold the thread"taut,'the operation oi' the arm 34 being more fully described hereinafter. The roller 33 is likewise provided withfaii `'arm 35 that extends outwardly andv over the groove in the roller 3,3 fork preventing the thread from moving out of the ygroove in the roller From the roller 33 the thread is carried 'downwardly and is threaded .through an eye .in an arcuate needle 36, the needle 36 beingl formed with a'groove (Fig. 17) inthe top tace thereoi'. The thread 13is presented to the needle so that as the needle moves in an arcuate pathv it will lie in the slot, the lneedle being threaded from the top through an eye, the

end of the strand 'of'tliread projecting Jfrom the bottom of the needle. Y

In the initial stitchy e e of the needle is brought over to the lett side of the machine and is engaged ,in

a'spring clip device 37 (Figs. .3 andv4).oii

the side? member of the roiithead 15 ot the housing.

at its lower end for 4out- The thread dl for the flower vertically upwardly i" forming'` operation lthe end of the-thread 7 after it leaves thei Thisiclip 37 is provided with` loop is supported on a spool 39` carried on a bracket 40 supported on the left side of thepedestal or column 2. The braclretr40`is provided with :tn-upwardly extending arm 41 having,- 'an eye rformed near its extremity and through lwhich the thread 8 passes. From the arin 41 the thread 8 is carried over and threadedl through `an eye f 42 supported by Ithe left side cover plate olf-the vliront, head housing. -Belowthe front head trame and progectinp,- beyond the left side thereof is a wax lpot (Fig. 4) that is slidably mounted on a rod 44 extending,- downwardly from the bottom of the front head frame.

A set screw 45 is provided yfor `the ladjustH .i

ment of the wax pot. y Thewax ypot is provided with a cover 46 likewise mounted yon the rodI 44 above the top edge of the wax pot,

lthe cover beingheld in adjustmentby a set screw 47 v Depending from the inner :tace of the cover 46 is an arm 43 that has a slottedeye at the lower extremity ,thereota rlhe wax 4pot cover iis y provided with an opening in the back edge thereof, the inner wall oll rwhich is in 'substantially vertical alinement with the eye 42 so that the thread 8 after being` passed through the eye 4Q isdrawn downwardly through the opening in the `cover of the wax pot and under the end or the varm 48, the thread seating in the slotted eye in the extreifnityy of the arm 48. lThe threadS is thencarried outwardly through a second opening inthe `iront edge of the wax pot cover. l

p Arranged just lbelow the point oit exit of the thread from the waxoot is a scraper device in the torni of a flat spring 49 attached to aweb 50 extendingrom the-arm48. vThe 'thread 3 moves between the spring 49 and theweb Oso that excess Quantities of' the wax carried up by the thread :troni the bottom or" the wai; Apotare scraped oihit being understood that a. supply. olf wax in semili uid form is maintained in the wax pot.

i roinv the wai; po' the thread. 3 is-carried y h an eye 51 supported 4by the lett; side nwall of the lool; thread-feeding attachrfient n and thence transversely through' an opening' 52 in the side wall of the loclr thread :Feeding attachment. The thread 8 is then carried-upwardly in the lool; thread feeding` attachment enteringl a slot 53 in the end of the bottomthread needle 547` (Figs. 2S, 'and "l`hence,` the thread '8 carried upwardly and drawn out through a slot 55 yin the'worlt platey 56 'which is smppcrtedl by vthe top covervoi' the lock ythread feeding attachment housing.

. Adjacent to andover-lyingr the end of the' Yneedle are two pins 57 that hold the lthread in position to be received in the Yslot 53 inthe end ci' operation. i

The lock thread 9 is supported on a spool Leedle when the needle is in 

